Repeat string

[morenol]

Solves #158

[flexferrum]

Thanks!

[morenol]

Something that I think that needs to be addressed in the future is the raising of errors if there are expressions with unsupported operands,

I mean:
{{ 'Hello' + 3 }} and {{ 'Hello' - 'Hello' }} should raise an error, shouldn't it?

[codecov]

Codecov Report

Merging #162 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   88.21%   88.22%   +0.01%     
==========================================
  Files          65       65              
  Lines        8305     8317      +12     
==========================================
+ Hits         7326     7338      +12     
  Misses        979      979

Impacted Files	Coverage Δ
test/expressions_test.cpp	84.05% <ø> (ø)	⬆️
src/value_visitors.h	66.74% <100%> (+0.95%)	⬆️

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[flexferrum]

Something that I think that needs to be addressed in the future is the raising of errors if there are expressions with unsupported operands,

That's a good idea but it's hard to implement. Problem here not in BinaryOperatorVisitor, but in diagnostic. We should store file location for each AST node (both statements and expressions). And this addition breaks the backward compatibility, so it should be enabled/disabled from the TemplateEnv settings.